Ich komme einfach nicht auf die richtige Formel dafür, bzw, verstehe ich nicht genau was und wie ich das in php berechnen soll:
Aufgabe:
Der Stromzähler liefert dir Antwort:
HEX : 43 70 80 00
Binär: 0100 0011 0111 0000 1000 0000 0000 0000
From this you can determine the following information.
·The sign bit is 0, indicating a positive number.
·The exponent value is 10000110 binary or 134 decimal. Subtracting 127 from 134 leaves 7, which is the actual exponent.
·The mantissa appears as the binary number 11100001000000000000000
There is an implied binary point at the left of the mantissa that is always preceded by a 1. This bit is not stored in the hexadecimal representation of the floating-point number. Adding 1 and the binary point to the beginning of the mantissa gives the following: 1.11100001000000000000000
Now, we adjust the mantissa for the exponent. A negative exponent moves the binary point to the left. A positive exponent moves the binary point to the right. Because the exponent is 7, the mantissa is adjusted as follows:
11110000.1000000000000000
Finally, we have a binary floating-point number. Binary bits that are to the left of the binary point represent
the power of two corresponding to their position. For example, 11110000 represents (1 x 27) + (1 x 26) + (1x 25) + (1 x 24) + (0 x 23)+ (0 x 22) + (0 x 21)+ (0 x 20) = 240.
Binary bits that are to the right of the binary point also represent a power of 2 corresponding to their position. As the digits are to the right of the binary point the powers are negative. For example: .100 represents (1 x 2-1) + (0 x 2-2)+ (0 x 2-3) + … which equals 0.5.
Adding these two numbers together and making reference to the sign bit produces the number +240.5.
Hier die komplette Doku : https://dl.dropboxusercontent.com/u/2476467/SDM630M%20protocol%20V2013-1.pdf
und hier mein Script:
<?
$RegVar = 59976 /*[Stromzähler Gesamt\Stromzähler Gesamt]*/ ;
//**********************Funktion für String in Hex umzuwandeln !!!!*************
function string2hex ( $string ) {
$hex = NULL;
for ( $ix=0; $ix < strlen($string); $ix=$ix+1 ) {
$char = substr( $string, $ix, 1 );
$ord = ord ( $char );
if ( $ord < 16 ) {
$hex .= '0'.dechex( $ord );
}
else {
$hex .= dechex( $ord );
}
// add line break or space
if ( $ix && ($ix % 16) == 15 ) {
$hex .= "
";
}
else {
$hex .= " ";
}
}
// strip trailing space or linebreak
return substr( $hex, 0, -1 );
}
function hex2string( $hex ) {
$string = NULL;
// strip linebreaks and spaces
$hex = str_replace( array("
","\r"," "), "", $hex );
for ( $ix=0; $ix < strlen($hex); $ix=$ix+2 ) {
$ord = hexdec( substr( $hex, $ix, 2 ) );
$string .= chr( $ord );
}
return $string;
}
// Umrechnung
$data = RegVar_GetBuffer($RegVar);
$value = "01 04 04 43 70 80 00 00 00";
//$value = String2Hex($data);
$value = explode(' ', $value);
$wert3=$value[3];
$wert4=$value[4];
$wert5=$value[5];
$wert6=$value[6];
//print "$wert3
$wert4
$wert5
$wert6
";
$wert3=base_convert($wert3,16,10);
$wert4=base_convert($wert4,16,2);
$wert5=base_convert($wert5,16,2);
$wert6=base_convert($wert6,16,2);
$wert3="127-$wert3"; // Exponent
//print "$wert5
";
//print "$wert3
$wert4
$wert5
$wert6
";
$wert41="1$wert4";
$wert51="$wert5";
//print "
$wert41
";
$wert6="$wert41$wert51$wert6";
//print $wert6;
$wert7=substr ($wert6, 0, 8);
$wert8=substr ($wert6, 8, 3);
$wert9=substr ($wert6, 16, 20);
//print "$wert7
$wert8
$wert9
";
$test=bindec($wert6);
$ergebins1=bindec($wert7);
$ergebins2=bindec($wert8);
$ergebins3=bindec($wert9);
$end="$ergebins1,$ergebins2,$ergebins3";
//print $test;
print $end;
//setvalue(48720 /*[Stromzähler Gesamt\Stromzähler Gesamt\Buffer]*/ ,$end);
//$buffer=getvalue(48720 /*[Stromzähler Gesamt\Stromzähler Gesamt\Buffer]*/ );
//setvalue($al1,$buffer);
RegVar_SetBuffer($RegVar, ""); //Variable löschen
?>
